CaltechAUTHORS
Published November 13, 2017 | Version Supplemental Material + Published
Journal Article Open

Low-frequency optical phonon modes and carrier mobility in the halide perovskite CH_3NH_3PbBr_3 using terahertz time-domain spectroscopy

Creators

Abstract

As a light absorber in photovoltaic applications, hybrid organic-inorganic halide perovskites should have long and balanced diffusion lengths for both the separated electrons and holes before recombination, which necessitates high carrier mobility. In polar semiconductors, the room-temperature carrier mobility is often limited by the scattering between carriers and the lowest-frequency optical phonon modes. Using terahertz time-domain spectroscopy, we examine the temperature evolution of these phonon modes in CH_3NH_3PbBr_3 and obtained high carrier mobility values using Feynman's polaron theory. This method allows us to estimate the upper limit of carrier mobilities without the need to create photogenerated free carriers, and can be applied to other heteropolar semiconductor systems with large polarons.

Additional Information

© 2017 Published by AIP Publishing. Received 29 June 2017; accepted 2 November 2017; published online 16 November 2017. D.M.Z. acknowledges support from TUM-CREATE. E.E.M.C. acknowledges support from the Singapore Ministry of Education AcRF Tier 1 (RG123/14) and Tier 2 (MOE2015-T2-2-065 and MOE2016-T2-1-054). C.L. acknowledges support from the Theoretical and Computational Science (TaCS) Center and Thailand Research Fund (MRG6080264). R.A.M. thanks the ONR and ARO for their support. M.-E.M.-B. is grateful to the Nanyang Technological University for supporting the Biophysics Center. The work was supported in part by the Center for Integrated Nanotechnologies, a U.S. DOE BES user facility. J.M.S. is grateful for support from the UK Engineering and Physical Sciences Research Council (EPSRC; Grant No. EP/P007821/1). Calculations were performed on the SiSu supercomputer at the IT Center for Science (CSC), Finland, via the Partnership for Advanced Computing in Europe (PRACE) Project No. 13DECI0317/IsoSwitch.

Attached Files

Published - 1.4993524.pdf

Supplemental Material - mapbbr3_si_apl.pdf

Files

1.4993524.pdf

Files (2.5 MB)

Name Size Download all
md5:30cf0afbcdd8394ec2820ea6cbfac909
753.9 kB Preview Download
md5:c05bf82b33e9965652c91dcc34c91be9
1.8 MB Preview Download

Additional details

Additional titles

Alternative title
Low-frequency optical phonon modes and carrier mobility in the halide perovskite CH3NH3PbBr3 using terahertz time-domain spectroscopy

Identifiers

Eprint ID
83420
Resolver ID
CaltechAUTHORS:20171122-075047461

Funding

TUM-CREATE
Ministry of Education (Singapore)
RG123/14
Ministry of Education (Singapore)
MOE2015-T2-2-065
Ministry of Education (Singapore)
MOE2016-T2-1-054
Theoretical and Computational Science (TaCS) Center
Thailand Research Fund
MRG6080264
Office of Naval Research (ONR)
Army Research Office (ARO)
Nanyang Technological University
Department of Energy (DOE)
Engineering and Physical Sciences Research Council (EPSRC)
EP/P007821/1
Partnership for Advanced Computing in Europe (PRACE)
13DECI0317/IsoSwitch

Dates

Created
2017-11-22
Created from EPrint's datestamp field
Updated
2021-11-15
Created from EPrint's last_modified field